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Leptaena sperion
Taxonomy
Leptaena sperion was named by Bassett (1977) [= Leptaena rhomboidalis Barrande 1879. pl. 41 figs. 28, 33 (non pl. 41 figs. 1-27, 29-32, 34-38).
= Leptaena rhomboidalis Holtedahl 191670, pl. 12 figs. 1--2, 5, 8--10, (11 ?), 12 (non BASSETT 1977).
= Leptaena depressa vulgaris -- Havlicek 1967: 93, pl. 15 figs. 1, 2, 4, 5, 10, 11 (non pl. 15 figs. 8, 9, pl. 16 figs. 10, 12).
= Leptaena depressa vulgaris -- Havlicek & Storch 1990: 72, pl. 12 figs. la, b, 2a, b, 6-8 (non pl. 12 figs. 3-5, 9, 10, text-fig. 9).]. Its type specimen is BGS GSM.12683, a valve (ventral valve), and it is a 3D body fossil. Its type locality is Woolhope, which is in a Sheinwoodian deep subtidal shelf limestone/shale in the Woolhope Limestone Formation of the United Kingdom.
Sister species lacking formal opinion data
Synonymy list
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Leptaena sperion Bassett 1977
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| O. A. Hoel 2005 | Large species of Leptaena with large number of irregular, shallow rugae. Dorsal peripheral rim very low. Chilidium massive, convex; pseudodeltidium small and flat. Cardinal process lobes large and diverging. Teeth strong, sockets deep, with accessory denticles along their whole length. |
Measurements
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| Source: g = genus, c = class, p = phylum, uc = unranked clade | |||||
| References: Hendy et al. 2009, Nesnidal et al. 2013, Aberhan et al. 2004 | |||||
Age range: base of the Telychian to the top of the Sheinwoodian or 438.50000 to 430.50000 Ma
Collections (7 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Telychian | Sweden (Gotland) | Leptaena sperion (13638) | |
| Sheinwoodian | United Kingdom (Wales) | Leptaena sperion (type locality: 169854) | |
| Sheinwoodian | Sweden (Gotland) | Leptaena sperion (169862 169866 169868) | |
| Sheinwoodian | Sweden | Leptaena sperion (476 61761) |